日本沿岸における海中生物騒音の分布

概要

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Many well-known scientists are constantly investigating underwater sound with the knowledge that it will be of much benefit to mankind. Such studies like the underwater sounds of snapping shrimps have resulted to the easy location of many species by tracing the produced sound. Location by sound may also be used to gain knowledge of other marine animals in migration, feeding or even spawning. The author made a general survey of the underwater sounds along the coastal waters of Japan, paying great emphasis in the nature of the waters where observations were made. It was observed that the following factors produce certain effects at various degrees; 1) bottom material, 2) geographical difference in latitude, 3) water depth, 4) distance from the shore and 5) structure of the coastline. Frying noise was only observed in relatively warm areas below Lat. 4l°46N. For bottom materials, excellent underwater sound recordings were made in muddy areas followed by rock and sand. Frying noise was observed only up to 100m deep. Considering other factors to be uniform, the distance from the shore produced no change in the frequency of frying noise. In semi-enclosed areas, the sound frequency was greatest at the entrance.
公益社団法人日本水産学会の論文